1. Reprints: Xavier Leroy, MD, Service d'Anatomie et de Cytologie Pathologiques, Faculté de Médecine, pôle recherche, rue M Polonowski, 59045 Lille cedex, France (x-leroy@chru-lille.fr).
2. From the Departments of Pathology (Drs Leroy and Gosselin), Radiology (Dr Lemaitre), Urology (Dr De La Taille), and Nephrology (Dr Hazzan), University Hospitals, Lille, France; the Department of Urology, General Hospital, Boulogne sur Mer, France (Dr Delepaul); and the Department of Cytogenetics, Curie Institute, Paris, France (Dr Couturier).